Permaculture (permanent agriculture) is the conscious design and maintenance of agriculturally productive ecosystems which have the diversity, stability, and resilience of natural ecosystems. It is the harmonious integration of langscape and people providing their food, energy, shelter, and other material and non-material needs in a sustainable way. Without permanent agriculture there is no possibility of a stable social order.
As pointed out beforehand, this is only Chapter #4: "Pattern Understanding" and not the whole book, thus the archive.org identifier is misleading. The scan quality is bad - b/w, pages are not straight.